Called a Ridge Ring from more extreme die deterioration This is a great indicator found on any coin for die deterioration. You'll see all variants of it as you look.
Is it a valid or collectible coin error? Is it insignificant and common?? Thank you for helping me. I’m as new to this as it gets. Thirsty for knowledge and needing lots of patient help. Much appreciated. I posted another picture of a different rim error on this thread.